Fun fact: a tortilla, being made of cereal flour, is classified as a bread. That means tacos are sandwiches.

At least culinarily, but actually coded in law in Indiana.

https://en.wikipedia.org/wiki/Sandwich#Language

This debate has spawned many Internet memes! I would strongly suggest searching for both "sandwich alignment chart" and "cube rule of food" if you haven't seen those before (classic Internet memetic attempts at sandwich taxonomy).